My build isn't booting to BIOS and I don't know why. I've unmounted everything from the case and did a barebone setup (no SSD/HDD just cpu + 1 stick of RAM in A2)

I've tried to carefully match instructions from the forum regarding power supply slots (which I believe i did correctly) I still get a number of Dr Debug codes but it never really stops at one so I can't tell what's wrong.

The RAM I use is CMR64GX4M4A2666C16 (Vengeance 16gb @2666, I believe it was on the compatibility list when I bought it)

My 1080ti GPU is secondhand but I was told it worked (I unfortunately can't get my hands on a spare ATM)

Based on the things I read from you, and the posted video, I could swear that your mobo did actually POST! Dr.Debug should code should stay lit ONLY if mobo can't get a certain POST step.

Your GPU fans also spin up and then stop, as expected.

A few things come in mind here:- GPU or monitor hates that DVI cable for some reason. Try with HDMI or DP. Or any other monitor cable.- re-seat the CPU for a good measure.- clear CMOS (again?)

Also, maybe it has something to do with the GPU placed in the 3rd PCIe slot? Can you mount your cooler at 90° and try the first PCIe slot? Maybe a PCIe riser cable will help just for the troubleshooting? Last resort - rotate the cooler and keep it in contact with the CPU only by hand (potential danger to CPU!); this should let you try PCIe slot #1 for the trial.

P.S. that vertical video is a killer, but I can understand the stress and the frustration!

Looking at your video it seems like you are posting (debug codes clear).

Your debug display went through all the correct codes and didn't seem to hang up anywhere. That tells me that your GPU is working but you are not getting a signal from it. That could be caused by either a bad/incompatible cable or a break in the signal chain on the GPU's PCB, typically a fuse or a dead controller chip.

Try another cable, go though all the outputs you can. If that does not work then see if you can get your hands on another GPU to test with.

From what I am seeing in your video it looks like the GPU is the culprit. As I said in my last post, the fact that it is not giving a GPU error code means the GPU hardware is working but that does not necessarily mean it is outputting a display, particularly if the output circuitry is blown.

Before you go pulling anything apart I would try another GPU. I am fairly sure that is where your issue is.

After having hooked up HDMI / DP / DVI to my current monitor (VP2772 2560x1440 QHD -- perhaps that's the reason ?) I phoned the seller who was adamant the GPU worked fine so I hooked it up to a videoprojector which is low resolution and I can see the BIOS screen!

Hopefully I can go on to build my rig, do everything with the videoprojector and switch back to monitor when drivers are installed.

Thanks for your quick help! Just posting this for google spiders it might help someone someday.

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